NTSB Identification: SEA98LA173.
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Accident occurred Wednesday, September 02, 1998 in CASCADE, ID
Probable Cause Approval Date: 01/11/2000
Aircraft: Koskella LONG EZ, registration: N5159P
Injuries: 2 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The pilot, a Navy test pilot with approximately 1500 hours total flight time in the Long EZ, reported that on short final the aircraft began to settle rapidly and touched down hard approximately 250 feet short of the threshold. He indicated that there was no mechanical malfunction with the aircraft's power plant or systems. However, in his written report, he stated that on short final he 'scanned the instrument panel and noticed the airspeed read 100 mph. (This is way too high to stop a Long EZ on a 4000' runway.) Aircraft attitude seemed normal, approach was at appropriate altitude/lineup, so I reduced power and deployed the speed brake. In my aircraft, the speed brake blows closed at 95 mph from aerodynamic forces-it stayed out. As I mentally started processing the fact that the speed brake did not blow back, I sensed an increase in the rate of descent. I retracted the speed brake, added full power, and eased the nose up-touching down 250' short of the runway.' The pilot also reported that he believed the 'airspeed indicator stuck at 100 mph during final approach.' He stated that 'I'm not sure this could have reasonably been foreseen or prevented; higher approach speed would have prevented the settle that developed on short final, but I would have had to instantly recognize the airspeed indicator error. By the time I recognized an excess rate of descent and initiated a wave-off, it was too late to avoid touching down.'
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot's failure to maintain airspeed on final approach. Factors include inadequate remedial action and erroneous airspeed indications. Full narrative available
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